{
  "annotation_id": "1507c118-ff0c-4905-949c-856ab7456085",
  "date_created": "2026-03-02T18:01:25.134000Z",
  "date_modified": "2026-03-02T18:01:25.134000Z",
  "file_hash": "4e76a0d0b3f575b6877a440c18a2dca380e6e3f4d037ea50b428b0af1538d5aa",
  "private": false,
  "record": {
    "abstract": "A new method is proposed to produce population inversion on transitions\ninvolving the ground state of atoms. The method is realized experimentally with\nsodium atoms. Lasing at the frequency corresponding to the sodium D_2 line is\nachieved in the presence of pump radiation resonant to the D_1 line with helium\nas a buffer gas.",
    "arxiv_id": "physics/9906036",
    "authors": [
      "A. A. Apolonsky",
      "S. A. Babin",
      "S. I. Kablukov",
      "R. V. Markov",
      "A. I. Plekhanov",
      "A. M. Shalagin"
    ],
    "categories": [
      "physics.optics"
    ],
    "doi": "10.1103/PhysRevA.61.033408",
    "title": "Lasing on the D_2 line of sodium in helium atmosphere due to optical   pumping on the D_1 line (up-conversion)",
    "url": "https://arxiv.org/abs/physics/9906036"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "ff60b238-2a48-4c18-8fdb-868142ead6fb",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}